锦州市不同播期对玉米生长发育的影响

Effects of Different Sowing Dates on Growth and Development of Maize in Jinzhou City

为确定锦州地区玉米最适宜播期,探讨锦州地区不同气候条件下玉米叶面积指数(LAI)与干物质的关系,选用2个不同玉米品种农华101和丹玉39于8个不同播期开展分期播种试验,观测玉米不同生育期时间、LAI、干物质积累和生长率。试验结果表明,玉米过早播种并不一定使发育期提前;在整个发育期中,农华101的播期越晚LAI越高,第7期干物质积累效果较好,生长率最大;丹玉39早播和晚播玉米LAI、干物质积累和生长率均较低,第4~6期玉米LAI较高,干物质积累效果最好,生长率最大。

In order to identify optimum sowing date for maize in Jinzhou,and discuss relationship between leaf area index(LAI)and dry matter of maize under different climate conditions,two different maize varieties of Nonghua 101 and Danyu 39 were selected to conduct stage seeding test with eight sowing dates,and date of maize growth period,LAI,dry matter and growth rate were observed.Results showed that early planting of maize did not necessarily advance growth period.During whole growth period,in case of Nonghua 101,more later sowing date was,LAI was more higher,it had better dry matter accumulation and maximum growth rate at 7 th sowing date.LAI,dry matter accumulation and growth rate were relatively low of both early and late sowing date of Danyu 39,it had higher LAI,best dry matter accumulation and maximum growth rate at 4 th^6 th sowing date.